To cut a long story short, she met her now DH not long after her first DH died of cancer. Which is terrible and appalling as he was only in his early 50s. They had 2 early 20s DC together. The cancer returned I think 3 x and she rang me in tears a few times, I think drunk and late at night and I did speak to her then because why wouldn't you? I'm not a total bitch and if my phone is on (usually on airplane mode at night) I'll answer it if I know the number and not too late. I knew her first DH but only when I'd been to her house when the DC were younger. And she also came on an event with me to London once and left DC with him, when he was well and they were all younger. That went a bit strangely though, she ended up very drunk and in a late night bar with me after the event, crying on my shoulder about her DH, his work, they were ok together but there were issues... and their kids were under 10 then. Not LTB issues but she didn't seem that happy either and seemed to want to offload to me. I ended up seeing her onto the last train home which she just caught (she lives a fair bit further out than me) and rang her when she got back to ensure she got a cab from the station and didn't walk (not a nice walk gone midnight or just before) or get the bus either to her house.
I'd then get the odd text and phone call from her, chatty but sometimes drunk but really wanted to be friends with me, it seemed and not just use me as a hairdressing client. I went out a couple of times with her locally to a bar which was halfway between where we both live, and another time with a partner of mine, we met up with her first DH (one who'd died) as there's a restaurant I'd been to there which we all knew and liked a lot. The other town, I just don't like it, it's rough so I rarely go there and didn't want to go out there with her.
She met her current DH not long after her last one died and I was happy for them, am happy for them. She seems so happy and I'm genuinely pleased for her. Yes it was unexpected for her but she told me her DH who'd died had wanted her to move on with her life and find love. And her DC were happy. She'd had a nice but boring life she told me when we were out - she did do a couple of 'interesting/exciting things' but generally it was basic SAHM/W things and working around her DH's work and her DC, as you do with a family. She often told me she envied me being childfree and 'well off' and not with a controlling DH.
Again when we were out at a bar and the restaurant, she'd spoken to me about X or Y, girls at school who'd bullied her, cornering me in the toilets in the bar and restaurant or outside when she went for a smoke, and asking if I'd still heard from them or what they were up to! She did this on 2 separate occasions. I just said "no, not heard, and yeah, A (another mutual school friend) may be in touch with them". She kept pushing though, "do you see A?" I'd known A since we were about 3 and we'd been close friends and were in touch then too and still are in touch. But A's not on SM, and likes to keep her private life private, for various reasons! I almost felt like we were back at school again...
And that was the reason why as I said I was happy to keep FB/Instagram friends and use her once or twice over lockdown (when very hard to get decent hair appointments!) for hair and the odd text chat. Although I like a gossip and to chat over past times and memories I am very resilient, move on and try not to hold grudges and have had therapy where needed for issues.
I felt she very much hadn't moved on!
I've since heard, this morning, from a mutual schoolfriend of mine who we speak to not often but every few months or so and sometimes meet up, that this woman has been in touch with her as of this morning. Saying nothing about me (thank god!) but our mutual friend did say "why has ..... suddenly got in touch with me? It's been ages since I last heard from her, almost a year now!". I've not said anything about what's happened and I won't elaborate on it. I really can do without drama in my life, especially now. I value my true friends a lot my FB acquaintances!
I can now happily draw a line under this! The reason I originally posted about this, is it was so strange... Meeting my new boyfriend for lunch too today so that's something to make me smile at a new interesting NZ cafe/bar place. 
Thanks again to anyone who commented.